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Re: Trouble plotting BSpline

  • To: mathgroup at smc.vnet.net
  • Subject: [mg126314] Re: Trouble plotting BSpline
  • From: Bob Hanlon <hanlonr357 at gmail.com>
  • Date: Mon, 30 Apr 2012 04:43:22 -0400 (EDT)
  • Delivered-to: l-mathgroup@mail-archive0.wolfram.com
  • References: <201204290608.CAA10803@smc.vnet.net>

sdid = {
   {10000, 0.082925792}, {15000, 0.134594939},
   {20000, 0.172655752}, {25000, 0.215181799},
   {30000, 0.291941314}, {35000, 0.380820753},
   {40000, 0.457367638}, {45000, 0.510312566},
   {50000, 0.553051244}, {60000, 0.638103338},
   {75000, 0.761428875}, {100000, 0.902615352},
   {125000, 0.942802467}, {150000, 0.971082288},
   {200000, 0.989368488}};

cdfspline = BSplineFunction[sdid];

ParametricPlot[cdfspline[t], {t, 0, 1},
 AspectRatio -> 1,
 Epilog -> {AbsolutePointSize[3], Red, Point[sdid]}]


Bob Hanlon


On Sun, Apr 29, 2012 at 2:08 AM, paul <paulvonhippel at yahoo.com> wrote:
> I am having trouble plotting a BSpline. I fit the spline to data where y runs from 0 to 1, but when I try to plot the spline I see no curve, and I can't get the vertical axis to go above 0.15. I'm sure what I'm missing is simple. Many thanks for any corrections.
>
> In[1]:= sdid = {{10000, 0.082925792},
>  {15000, 0.134594939},
>  {20000, 0.172655752},
>  {25000, 0.215181799},
>  {30000, 0.291941314},
>  {35000, 0.380820753},
>  {40000, 0.457367638},
>  {45000, 0.510312566},
>  {50000, 0.553051244},
>  {60000, 0.638103338},
>  {75000, 0.761428875},
>  {100000, 0.902615352},
>  {125000, 0.942802467},
>  {150000, 0.971082288},
>  {200000, 0.989368488}}
>
> In[2]:= cdfspline = BSplineFunction[sdid]
> In[3]:= ParametricPlot[cdfspline[x], {x, 0, 2000000}, {y, 0, 10}, AspectRatio -> 1]
>



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